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Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland
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John Burns <john@unixnerd.demon.co.uk> haute in die Tasten:
> Just a guess, but I'd be surprised if the only difference between this
> and the normal 525i box isn't just the casing and maybe gear ratios
> (which will be VERY similar).
I doubt that. AFAIR the front wheel drive is located somewhere in the oil
pan, so the gearbox needs a second cam to deliver power to the front axle.
I suppose the parts are totally different and quite rare.
Frank

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Dave Plowman (News) - 06 Feb 2005 09:40 GMT
> > Just a guess, but I'd be surprised if the only difference between this
> > and the normal 525i box isn't just the casing and maybe gear ratios
> > (which will be VERY similar).
> I doubt that. AFAIR the front wheel drive is located somewhere in the
> oil pan, so the gearbox needs a second cam to deliver power to the
> front axle. I suppose the parts are totally different and quite rare.
But is the transfer box unique to this model? BMW don't make their own
gearboxes, so perhaps the internals at least are shared with another.

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John Burns - 06 Feb 2005 11:30 GMT
> But is the transfer box unique to this model? BMW don't make their own
> gearboxes, so perhaps the internals at least are shared with another.
Exactly. And I was under the impression the transfer housing just bolts
onto the back of the gearbox.

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Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland
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Somebody - 06 Feb 2005 13:38 GMT
> John Burns <john@unixnerd.demon.co.uk> haute in die Tasten:
>
[quoted text clipped - 5 lines]
> pan, so the gearbox needs a second cam to deliver power to the front axle.
> I suppose the parts are totally different and quite rare.
The gearbox is generally fairly similar because the front wheels are driven
aft of the transmission via a chain in the transfer case -- not sure what is
meant by a "second cam". The back end of the transmission case is different
to accomodate the TC. The ratios are probably the same, intead they change
the front and rear diff ratios if they are going to change anything.
I would suggest that donor parts for a rebuild might come from a regular
525i but the original casing and perhaps the output shaft equipment would
need to be retained. A guess though.
-Russ.